Forging machine



April 2, 1929. A T. M. STEPHENS 1,707,234

FORGING MACHINE Fi led Sept. 26, 1925 s Sheets-Sheet 2 5 1:2 I 54 w 59 F April 2, 1929. 1-. M. STEPHENS 1,707,234

FORGING MACHINE Filed Sept.26, 1925 3 Sheets-Sheet 3 1720672207": 772077105 772. Ste r272 ens yK/ Z Patented Apr. 2, 1929.

UNITED STATES PATENT OFFICE.

THOMAS M. sTEPrI'ENs, OF MICHIGAN CITY, INDIANA, ASSIGNOR r0 SULLIVAN MA- CHINERY GO'MIPANY, A CORPORATION OF MASSACHUSETTS.

FORGING MACHINE.

Application filed September lVhile this invention relates generally to improvements in the forging art, it is more particularly directed therein to an apparatus for forging cutter bits.

The finished cutter bits made by the method and apparatus herein described are similar to those which constitute the invention of one Sven T. Nelson, Ser. No. 549,858. In making cutter bits of this type, there have heretofore frequently been fins left on the cutting portion of the bit after completion of the forging Operation. These fins project forwardly from the cutting face dueto excess material at the cutter bit portion of the blank and possibly due to the particular type of forging dies which are preferably used. The preferred form of forging dies includes a stationary raised die whose transverse configuration substantially the same as that of the bit portion. The face of the bit during forging rests against a transverse face on the raised die. In order to form the lateral surfacesofthe bit portion a roller die is used having a peripheral groove the shape of which is substantially identical tothe transverse configuration of the raised die, thereby permitting the walls of the roller groove to come substantially in contact with the Walls of the raised die. Accordingly, if a bit blank has excess material at the end where the bit portion is formed, the rollor will squeeze. the material along the walls of the raised die thereby forming portions overhanging the cutter face. These portions, termed line, are preferably knocked or ground oif before the bit is used.

It is accordingly object of my invention to provide an improved apparatus for forg ing a bit substantially or Wholly without the formation of the fins. Broadly, the method of obtaining these bits with my improvec apparatus consists first in. thinning a blank end preferably by a swaging opera tion and then forging said end into a bit portion. More specifically, the steps of the method are as follows, although certain of the same may be omitted. First, one end of an elongatedblank whose transverse section is generally rectangular is out angularly as, 1925. semi no. 58,905.

to its" longitudinal axis to form a pointed end. The next step is to make thin the pointed end by tapering the same from the point back a substantial distance, this be ing d'one specifically herein by placing said end between opposed die surfaces which are angularly disposed so as to form substantially a wedge-shaped opening. The final step consists in forging the thinned end into a bit portion.

Itis also an object of myinvention to provide improved apparatus for thinning the blank end by a swaging operation and for forging the finished bit end. In View of the fact that the bits are worked while hot, it is highly desirable that the swaging and forging mechanisms be disposed closely adjacent each other to permit rapidtransfer of the blank from the swaging mechanism to the forging mechanism. To accomplish this I have utilized common actuating means for the swaging and forging mechanisms, this permitting increased efficiency due to the fact that while the forging operation is taking place the operator can simultaneously, if desired, be swaging a blank prior to a forging operation thereon. In the specific embodiment of the invention. one of the forging diesis mount-ed upon. a reciprocating cross head which is also true of the movable die of the swaging dies, the stationary die of the latter being fixedly carried by the cross head guiding frame. Cooperating with the swaging dies is improved means for shearing 05 any fins which may possibly be formed on the bits;

In the accompanying drawings I have shown for purposes of illustration one embodiment which my invention may assume in practice.

In these drawings,-

Fig. 1 is a fragmentary side elevation of the forging machine.

Fig. 2 is a front end elevation t-l'iereof.

Fig. 3 is a vertical longitudinal fragmentary section through the blank support and forging die supports, the forging dies and other parts being shown in elevation.

Fig. 4 is a fragmentary plan view taken substantially on the line 4.-4= of Fig. 1, and to show details of construction parts are broken away substantially as on line 4r"& of Fig.6. I

' Fig. is a fragmentary sectional plan view takenonline 5-5 of Fig. 6, the view being of the parts disposed as in Fig. 4.

Fig. 6 is a transverse section taken subjstantially on line 66 of Fig. 5.

I second step.

F 7 is-a perspective of a bit blank after. the first step'in' the method of forming the fcomplete'd bit. 1

Fig. 8 is a perspective of the swaging dies and the bit disposed therein during the Fig... 9 perspective of a bit blank after the swaging operation showing the thinned blank .end.

Fig. 10 is a-iperspective of the forgingdies and the sw aged blank in its relative position thereto.

Fig-111s a transverse sect on on the line 11-11 of'Fig. -10.

. suitably supportedframe 1 for guiding a cross head 2'jwhich is reciprocated by suitable mechanism'inc-luding a belt flywheel 3. Supported by the cross head 2 is a freely rotatab-le roller die 4 having a peripheral groove 5 adaptedto override a raised die 6.

.The transverse configuration of the raised die is substantially the same as the groove 5 sothat a bit blank 7' supported below the roller die will by having its bit face 8 resting upon the inclinedface 9 of the raised die permit forming of the lateral surfaces 10 of the bit portion by the walls of thegroove o. Themachme in other respects also such as the bit feeding and bit discharging mechanisms, is the same as that disclosed in the Johansen application. I To utilize the cross lgh'ead actuating mechanism for operating the swag-ing dies which effect thinning of the bit end I have provided a bracket 11 having a longitudinal arm 12 secured to the forging machine frame as bycap screws 13. An arm 14 depending from the longitudinal portion 12 is spaced forwardly from the front end 15 of the forging machine frame,

die surface 18 and a; vertical plane surface the'juncture of the longitudinal and depending arms being reinforced y suitable flanges 16. A stationary swaging die 17 has a vertically disposed and transversely inclined 19. The die 17 is secured to the arm 14 as bybolts 20 extending through the same adjacentthe plane surface, thereby leaving the bolt heads free .of the die surface 18 and cured to the cross head by a cap screw 26 extending through an opening 27 in the die and the cap screw head is receivable in a recess 28 in the surface 25. To allow the die surface to present a substantial amount of clear dio surface for cooperation with the die 17 the single screw 26 is used and disposed near the top of the die. The lower portion of the die has dowel pin holes 29 projecting inwardly from its back surface .30 to receive suitable dowel pins which project forwardly from the end of the cross head element 2 1. These dowel pins prevent angular displacement of the swaging die 21.). From Fig. 1 it will be seen that the die 23 extends above the die 17 and from Fig. -1- that the dies have laterally offset portions so that when a blank 7 is disposed between the dies only clear cooperating surfaces will be presented.

Vhile the above described structure when operated in the manner hereinafter described is capable of forming bits without fins, yet due to practical considerations such as the degree of skill possessed by the operator and material worked upon, small fins might be formed on the bits. To remove these fins I have provided .lll'lPl'OVGtl means cooperating with the swaging dies. This means comprises a shearing die generally indicated 35 having a cutting portion projecting forwardly from a body portion 37 which is disposed within a slot 38 formed in the front face of the die 23. A bolt 3% holds the die in the slot which, as shown in Fig. 6, is disposed in the upper half of the die 23 which is near the top of the die 17, thereby leaving the lower die surface of the die 17 entirely clear. As shown in Fi 5 and 6, the cutting portion 36 is adapted to cooperate with an edge 40 formed in one corner of the die 17 by cutting out the corner of the die as indicated at 41. As shown in Fig. 6, the cut-out portion 11 extends only a short distance. below the die 35, thereby leaving an unbroken die surface on the die 17 to cooperate with the lower die surface of the die 23.

The mode of operation will be more apparent from the following description of the method of operation, which consists in taking a blank 7 which is generally of rectangularshape and preferably forming a pointed end 31 such as by cutting, forging, or other lill suitable means. The pointed end 31 is then inserted between the dies 17 and 23 to be thinned as indicated in Fig. 9 at 32. The blank during the thinning or swaging operation may if desired beinclined slightly as indicated in Fig. 2, but the distance of the taper back from the point and the angular disposition of the blank between the swaging dies may be governed entirely by the operator in accordance with the kind of material being worked or the degree of i'forgingwhich is necessary to form a completed bit without formation of fins. After the thinning operation, the thinned end is forged by inserting the blank in the supporting means disposed below the roller die l as indicated in Fig. 3. In this posit-ion too thin end initially presents a relatively narrow amount of material to the forging die face 9 such as indicated in Fig. 11. Upon reciprocation of the roller die the walls of the groove therein will squeeze the material forwardly to fill out the bit portion until its transverse section is substantially the same as the transverse configuration of the raised die 6. It will thus be seen that by first thinning the blank end provision has been made for allowing the metal to be squeezed forwardly and out wardly without causing the metal to flow over the lateral sides of the raised die 6 which would cause fins overhanging the bit face 8. The finished blank will accordingly have a finished cutting face 8 as shown in Fig". 12. From this mode of operation it will be seen that the blank end when thinned may be variously shaped so as to prevent the overflowing of the metal onto the sides of the raised dies. In the operation of the shearing dies, assuming that fins have been formed on the bit, the latter will be so disposed that the cutting portion 36 cooperating with the edge lOWill shear off at one stroke of the cross head 24 fins overhaa'iging both cutting edges of the bit.

It will also be noted that due to having the swaging and forging dies actuated by common mechanism the operator can, while forging one die, place a blank between the swaging dies to perform the thinning operation and thereby save time. The structure and mode of operation employed does thereby permit a plurality of blank forming bperations siimiltaneously and by common actuating mechanism.

While I have in this application specifically described one form which my invention may assume in practice, it will be understood. that this form of the same is shown for purposes of illustration and that the invention may be modified and eniibodied in various other forms Without departing from its spirit or the scope of the appended claims.

l Vhat I claim as new and desire to secure by Letters Patent is: 1

1. A forging machine having swagmg dies, one of which has a recessed corner to form. cutting ec'lrge and a shearing die portion carried bythe other die to cooperate with said edge, t i

2. An attachment for a mining machine cutter bit sharpening machii'ie of the type comprising a frame, a stationary die, a reciprocable crosshcad and a movable die carried. thereby and cooperating with said stationary die said attachment comprising a stationary swaging die fixed to said frame, and a cooperating movable swaging die carried. by said crosshead.

3. An attachniient for a mining machine cutter bit sharpening machine of the type comprising a frame a stationary die, a reciprocable crosshead and a movable die pivotally mounted thereon and cooperating with said stationary die said attachment comprising a stationary swaging die fixed to said frame and a movable swaging die mounted on and movable with said crosshead, said swaging dieshaving relatively inclined cooperating swaging surfaces.

4. An attachment for a mining machine cutter bit sharpening machine of the type comprising a frame, a stationary die, areciprocable crosshead and. a roller die mounted 011 said crosshead and cooperating with said stationary die, said attachment comprising a stationary swaging die fixed to said frame,

and a cooperating movable swaging die carried by said crosshead, said swaging dies being so constructed as to leave a wedgeshaped space between them when in closed position,

v5. An attachment for a mining machine cutter bit sharj'iening machine. of the type coumrising a frame a stationary die, a reciprocahlo crosshoad. and a movable die carried thereby and cooperating with said stationary die, said attachment comprising a movable swaging die secured to a vertical face on said crossheach an arm fixed to said frame having a vertically depending portion, and a stationary swaging die mounted on said portion. and cooperating with said other swaging die for a swinging o 'ieration upon a cutter bit prior to being sharpened in said first mentioned dies.

6. An attachment for a mining machine cutter bit sharpening machine of the type comprising a frame, a stationary die, a reciprocable crosshead and a movable die carricd thereby and cooperating with said sta tionary die, said attachment comprising a stationary swaging die fixed to said frame, a cooperating movable swaging die carried by said crosshead, and a shearing attachment for said machine comprising cooperating elements on each of said swaging dies.

7; An attachment for a mining machine cutter hit sharpening machine of the type comprising a frame, a stationary die, a reciproeableerosshead and a movable die car- 5 r-ied thereby and cooperating with said stationaiy die, said attachment comprising a stationary swaging die-fixed to said frame, a cooperating movable swaging die carried by said ei'osshead, and a shearing attachment for sa-id'niaehine comn'ising a shearing die relnovably mounted on one of said swaging surfaee'on the other of said swaging dies.

In testimony whereof I afl'ix my signature.

THOMAS M. STEPHENS.

ies to coo aerate with a shearin (J 

